Preparation method of collaborative post-treatment type anti-corrosion reinforced concrete

Abstract

The present invention discloses a preparation method of a collaborative post-treatment type anti-corrosion reinforced concrete, belonging to the field of anti-corrosion of reinforced concrete. Compared with the traditional pre-treatment method, the present invention adopts a collaborative post-treatment method to perform anti-corrosion treatment on the already cured reinforced concrete. Through the way of assisted transmission by flowing water, first make the rust inhibitor migrate and transmit to the surface of the steel bars, and then transmit part of the nano-materials in the outer layer of concrete to synergistically exert the high-efficiency anti-corrosion effect of film-forming and chlorine resistance. The collaborative post-treatment type anti-corrosion reinforced concrete prepared by the present invention has the advantages of not affecting the self-performance of the concrete, good transmission effect of the rust inhibitor, less dosage of nano-materials, etc., and can also effectively improve the anti-corrosion effect.

Description

Technical Field

[0001] The present invention relates to the field of anti-corrosion of reinforced concrete, and particularly to a preparation method of a synergistic post-treatment type anti-corrosion reinforced concrete. Background Art

[0002] Reinforced concrete structures are widely used in civil engineering, water conservancy, and transportation engineering, and they have the characteristics of high strength, good economy, etc. However, during the long-term service of reinforced concrete structures, they often face the problem of chloride pollution. Chloride ions are transmitted to the surface of the steel bars through the pores in the concrete. When the concentration exceeds a certain value, the steel bars will start to corrode, and in severe cases, it will even endanger the structural safety.

[0003] Currently, common anti-corrosion measures include adding steel bar corrosion inhibitors, concrete coatings, and cathodic protection, etc. Among them, adding corrosion inhibitors is a simple and direct corrosion control method and has been widely used. However, there are still some significant problems in the current application process of corrosion inhibitors. First of all, the current corrosion inhibitors are usually added to the concrete during the concrete mixing stage. The addition of corrosion inhibitors often affects the workability of the concrete mixing, and the corrosion inhibitors often participate in the hydration process during the cement hydration process and cause negative effects. Secondly, when the corrosion inhibitor is incorporated into the concrete by the traditional method, due to the contact with a large amount of ionic dissolved cement clinker during the cement hydration process, a certain degree of combination between some corrosion inhibitors and the cement hydration products occurs, which increases the difficulty of their migration. In fact, the problem of low migration efficiency of corrosion inhibitors in concrete has always been an important factor restricting their development. In recent years, some corrosion inhibitor pretreatment methods have emerged, which can form the corrosion inhibitor or conversion film on the surface of the steel bars / metal in advance through the pretreatment method. However, during the process of mixing reinforced concrete, the pretreatment film is easily damaged by the physical abrasion of concrete sand and gravel. From the application process of the corrosion inhibitor, the above-mentioned use methods of the corrosion inhibitor can be classified as the pre-treatment type. Moreover, the corrosion protection mechanism of the corrosion inhibitor for the steel bars is mainly to protect the steel bars from corrosion by adsorption or passivation, but its anti-corrosion process only occurs on the surface of the steel bars, and there is often a lack of inhibition for the chloride ion erosion and transmission process occurring in the concrete. Summary of the Invention

[0004] The purpose of the present invention is: in view of the problems of poor compatibility, difficult migration, and single performance often faced during the application process of traditional corrosion inhibitors, a preparation method of a synergistic post-treatment type anti-corrosion reinforced concrete is proposed. After the concrete is cured, a mode of using flowing water to assist in transmission is adopted, so that the corrosion inhibitor enters the concrete and reaches the surface of the steel bars through migration and transmission to play an anti-corrosion role.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A preparation method of a synergistic post-treatment type anti-corrosion reinforced concrete, comprising the following steps:

[0006] (1)Preparation of reinforced concrete blocks to be processed:

[0007] The water-cement ratio of the concrete is 0.5, the mass ratio of cement: sand: gravel is 1:3:2, and the size of the concrete block is 10×10×10 cm. The selected steel bar material is Q235 steel, and the size of the steel bar is 1 cm in diameter and 15 cm in length. During the concrete mixing process, polycarboxylate water reducer with a mass of 0.1% of the solution is added.

[0008] (2)Post-treatment process:

[0009] a) Post-treatment with rust inhibitor

[0010] Place the reinforced concrete block in the pre-prepared rust inhibitor solution, and then use a magnetic stirring device to control the rotation of the solution. During the whole process, the top of the container containing the rust inhibitor is sealed. Among them, the magnetic stirring mode is set to cyclic stirring, and the next cycle will be automatically repeated after one cycle ends. The total cyclic stirring time lasts for 14 days. The process of one cyclic stirring is: stir clockwise for 3 - 8 min, pause for 2 min, and stir counterclockwise for 3 - 8 min. The stirring speed is 300 rpm / min. During the stirring process, seal the container and control the temperature of the soaking solution to be 45 - 55 °C.

[0011] b) Post-treatment with nano-solution

[0012] Place the reinforced concrete test block treated in step a) in the pre-prepared nano-material solution, and then use a magnetic stirring device to control the rotation of the solution. Among them, the magnetic stirring mode is set to cyclic stirring, and a total of 4 - 6 cycles are carried out. The process of one cyclic stirring is: stir clockwise for 4 - 8 hours, pause for 8 hours, and stir counterclockwise for 4 - 8 hours. The stirring speed is 500 rpm / min. During the stirring process, seal the container and control the temperature of the soaking solution to be 60 - 70 °C. Then take out the reinforced concrete block, rinse it with tap water and dry it to obtain the corrosion-resistant reinforced concrete with synergistic post-treatment.

[0013] Furthermore, after the reinforced concrete is poured in step (1), it is left to stand in a 25 °C environment for 1 d and then demolded, and then cured in an environment of 25 °C temperature and 95% humidity for 28 d and then taken out.

[0014] Furthermore, in the rust inhibitor solution in step (2), the rust inhibitor is triethylenetetramine or 1,6-hexanediamine or pyridoxine, and the mass fraction of the rust inhibitor in the solution is: 0.1% - 0.5%.

[0015] Further, in the nano-material solution in step (2), the nano-material is carbon nanotube or nano-silica. The mass fraction of carbon nanotube in the solution is 0.1% - 0.3%, the dispersant is sodium dodecyl benzene sulfonate, and the dosage is 10% of the dosage of carbon nanotube; the mass fraction of nano-silica in the solution is 0.5 - 1.5%, the dispersant is cetyltrimethylammonium bromide, and the dosage is 30% of nano-silica.

[0016] Further, in step (2), after the solution is prepared, ultrasonic treatment is used to disperse the nano-material solution, and then the solution post-treatment process is started. The ultrasonic time is 15 min, and the ultrasonic frequency is 20 kHz.

[0017] Compared with the prior art, the advantages of the present invention are as follows:

[0018] 1. In the traditional method, the corrosion inhibitor is usually added to the concrete during the concrete mixing stage, which is likely to have a negative impact on the performance of the concrete material itself and has low migration and transmission efficiency. In order to effectively avoid the problems of migration difficulties, compatibility problems, and abrasion and damage problems brought by the pretreatment method, the present invention invents a post-treatment anti-corrosion and rust-inhibiting method. When the corrosion inhibitor enters through the flowing water transmission, the concrete has basically been cured, and the hydration activity state of the cement is greatly reduced, effectively avoiding the negative impacts of the traditional pretreatment method;

[0019] 2. The flowing water-assisted transmission mechanism proposed in the present invention effectively facilitates the transmission of the corrosion inhibitor molecules in the concrete pores and has no impact on the performance of the concrete and steel bars themselves. It is an efficient, economical, and environmentally friendly means of corrosion inhibitor migration;

[0020] 3. Nano-materials are expensive. In the current research on nano-modified cement-based materials, nano-materials are usually incorporated into the cement-based materials during the mixing stage. On the one hand, this will lead to too high a dosage of nano-materials and high economic costs; on the other hand, adding nano-materials during the mixing stage often greatly affects the workability of the cement-based materials. The present invention adopts the method of flowing water-assisted transmission. After the concrete is cured, a certain amount of nano-materials are migrated in the outer-layer concrete. On the one hand, the dosage of nano-materials is greatly reduced, and on the other hand, the penetration of chloride ions is effectively inhibited;

[0021] 4. On the basis of applying the corrosion inhibitor, the present invention introduces nano-materials through the post-treatment methods of flowing water and temperature rise, improving the compactness of the outer-layer concrete and playing a synergistic post-treatment anti-corrosion role of film-forming and chlorine inhibition. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the relationship between the open-circuit circuit and the immersion time in the specific implementation manner. Specific Embodiments

[0023] For better explaining the present invention, the technical solutions of the present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be noted that all the technologies and scientific terms used in the present invention have the same meanings as those commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0024] Example 1

[0025] 1. Preparation of reinforced concrete blocks to be processed:

[0026] The water-cement ratio of the concrete is 0.5, the mass ratio of cement: sand: gravel is 1:3:2, and the size of the concrete block is 10×10×10 cm. The selected steel bar material is Q235 steel, and the size of the steel bar is 1 cm in diameter and 15 cm in length. A polycarboxylate water reducer with a content of 0.1% of the solution mass is added. After the reinforced concrete is poured, it is left standing in an environment of 25°C for 1 d and then demolded, and then cured in an environment of 25°C and 95% humidity for 28 d and then taken out.

[0027] 2. Post-rust inhibition treatment process:

[0028] a) Post-treatment with rust inhibitor

[0029] First, prepare a rust inhibitor solution: the rust inhibitor is triethylenetetramine, and the mass fraction of the rust inhibitor in the solution is 0.1%.

[0030] Then place the reinforced concrete block in the pre-prepared rust inhibitor solution, and then control it with a magnetic stirring device to make the solution rotate. During the whole process, the top of the container containing the rust inhibitor is sealed. Among them, the magnetic stirring mode is set to cyclic stirring, and the next cycle is automatically repeated after one cycle ends. The total cyclic stirring time lasts for 14 days. The process of one cyclic stirring is: stir clockwise for 3 min, pause for 2 min, and stir counterclockwise for 3 min. The stirring speed is 300 rpm / min. During the stirring process, the container is sealed, and the temperature of the soaking solution is controlled at 45°C.

[0031] b) Post-treatment with nano-solution

[0032] First, prepare a nano-material solution: the nano-material is carbon nanotubes, and the mass fraction of carbon nanotubes in the solution is 0.1%; the dispersant is sodium dodecylbenzenesulfonate, and the dosage is 10% of the carbon nanotube dosage; the nano-material solution is dispersed by ultrasonic waves, the ultrasonic time is 15 min, and the ultrasonic frequency is 20 kHz.

[0033] Then place the reinforced concrete specimens processed in step a) into a pre-prepared nano-material solution, and then use a magnetic stirring device to control the rotation of the solution. Among them, the magnetic stirring mode is set to cyclic stirring, and a total of 4 cycles are carried out. The process of one cyclic stirring is: stir clockwise for 4 hours, pause for 8 hours, and stir counterclockwise for 4 hours. The stirring speed is 500 rpm / min. During the stirring process, seal the container and control the temperature of the immersion solution at 60 °C. Then take out the reinforced concrete block, rinse it with tap water and dry it to obtain the synergistic post-treatment anti-corrosion type reinforced concrete.

[0034] Example 2

[0035] 1. Preparation of reinforced concrete blocks to be treated:

[0036] The water-cement ratio of the concrete is 0.5, the mass ratio of cement: sand: gravel is 1:3:2, and the size of the concrete block is 10×10×10 cm. The selected steel bar material is Q235 steel, and the size of the steel bar is 1 cm in diameter and 15 cm in length. Add polycarboxylate water reducer with a content of 0.1% of the solution mass. After the reinforced concrete is poured, it is left standing in an environment of 25 °C for 1 d and then demolded, and then cured in an environment of 25 °C temperature and 95% humidity for 28 d and then taken out.

[0037] 2. Post-rust inhibition treatment process:

[0038] a) Post-treatment with rust inhibitor

[0039] First, prepare a rust inhibitor solution: the rust inhibitor is 1,6-hexanediamine, and the mass fraction of the rust inhibitor in the solution is 0.3%.

[0040] Then place the reinforced concrete block into the pre-prepared rust inhibitor solution, and then use a magnetic stirring device to control the rotation of the solution. During the whole process, the top of the container containing the rust inhibitor is sealed. Among them, the magnetic stirring mode is set to cyclic stirring, and after one cycle ends, it automatically repeats the next cycle, and the total cyclic stirring time lasts for 14 days. The process of one cyclic stirring is: stir clockwise for 5 min, pause for 2 min, and stir counterclockwise for 5 min. The stirring speed is 300 rpm / min. During the stirring process, seal the container and control the temperature of the immersion solution at 50 °C.

[0041] b) Post-treatment with nano-solution

[0042] First, prepare a nano-material solution: the nano-material is carbon nanotubes, and the mass fraction of carbon nanotubes in the solution is 0.2%; the dispersant is sodium dodecylbenzenesulfonate, and the dosage is 10% of the carbon nanotube dosage; use ultrasonic to disperse the nano-material solution, the ultrasonic time is 15 min, and the ultrasonic frequency is 20 kHz.

[0043] Then, place the reinforced concrete test blocks processed in step a) into a pre-prepared nano-material solution, and then use a magnetic stirring device to control the rotation of the solution. Among them, the magnetic stirring mode is set to cyclic stirring, and a total of 5 cycles are carried out. The process of one cyclic stirring is: stir clockwise for 6 hours, pause for 8 hours, and stir counterclockwise for 6 hours. The stirring speed is 500 rpm / min. During the stirring process, seal the container and control the temperature of the soaking solution at 65°C. Then take out the reinforced concrete blocks, rinse them with tap water and dry them to obtain the synergistic post-treatment anti-corrosion reinforced concrete.

[0044] Example 3

[0045] 1. Preparation of the reinforced concrete blocks to be treated:

[0046] The water-cement ratio of the concrete is 0.5, the mass ratio of cement:sand:stone is 1:3:2, and the size of the concrete block is 10×10×10 cm. The selected steel bar material is Q235 steel, and the size of the steel bar is 1 cm in diameter and 15 cm in length. Add a polycarboxylate water reducer with a content of 0.1% of the solution mass. After the reinforced concrete is poured, it is left to stand in a 25°C environment for 1 day and then demolded, and then cured in a 25°C temperature and 95% humidity environment for 28 days and then taken out.

[0047] 2. Post-rust inhibition treatment process:

[0048] a) Post-treatment with rust inhibitor

[0049] First, prepare a rust inhibitor solution: the rust inhibitor is pyridoxine, and the mass fraction of the rust inhibitor in the solution is 0.5%.

[0050] Then place the reinforced concrete blocks into the pre-prepared rust inhibitor solution, and then use a magnetic stirring device to control the rotation of the solution. During the whole process, the top of the container containing the rust inhibitor is sealed. Among them, the magnetic stirring mode is set to cyclic stirring, and after one cycle ends, it automatically repeats the next cycle, and the total cyclic stirring time lasts for 14 days. The process of one cyclic stirring is: stir clockwise for 8 min, pause for 2 min, and stir counterclockwise for 8 min. The stirring speed is 300 rpm / min. During the stirring process, seal the container and control the temperature of the soaking solution at 55°C.

[0051] b) Post-treatment with nano-solution

[0052] First, prepare a nano-material solution: the nano-material is carbon nanotubes, and the mass fraction of carbon nanotubes in the solution is 0.3%; the dispersant is sodium dodecylbenzenesulfonate, and the dosage is 10% of the carbon nanotube dosage; use ultrasonic to disperse the nano-material solution, the ultrasonic time is 15 min, and the ultrasonic frequency is 20 kHz.

[0053] Then, place the reinforced concrete test block processed in step a) into the pre-prepared nano-material solution, and then use a magnetic stirring device to control the rotation of the solution. Among them, the magnetic stirring mode is set to cyclic stirring, and a total of 6 cycles are carried out. The process of one cyclic stirring is: stir clockwise for 8 hours, pause for 8 hours, and stir counterclockwise for 8 hours. The stirring speed is 500 rpm / min. During the stirring process, seal the container and control the temperature of the immersion solution at 70 °C. Then take out the reinforced concrete block, rinse it with tap water and dry it to obtain the synergistic post-treatment anti-corrosion type reinforced concrete.

[0054] Example 4

[0055] 1. Preparation of the reinforced concrete block to be treated:

[0056] The water-cement ratio of the concrete is 0.5, the mass ratio of cement:sand:stone is 1:3:2, and the size of the concrete block is 10×10×10 cm. The selected steel bar material is Q235 steel, and the size of the steel bar is 1 cm in diameter and 15 cm in length. Add polycarboxylate water reducer with a content of 0.1% of the solution mass. After the reinforced concrete is poured, it is left to stand in an environment of 25 °C for 1 day and then demolded, and then cured in an environment of 25 °C temperature and 95% humidity for 28 days and then taken out.

[0057] 2. Post-rust inhibition treatment process:

[0058] a) Post-treatment with rust inhibitor

[0059] First, prepare the rust inhibitor solution: the rust inhibitor is triethylenetetramine, and the mass fraction of the rust inhibitor in the solution is 0.1%.

[0060] Then, place the reinforced concrete block into the pre-prepared rust inhibitor solution, and then use a magnetic stirring device to control the rotation of the solution. During the whole process, the top of the container containing the rust inhibitor is sealed. Among them, the magnetic stirring mode is set to cyclic stirring, and after one cycle ends, it automatically repeats the next cycle, and the total cyclic stirring time lasts for 14 days. The process of one cyclic stirring is: stir clockwise for 3 min, pause for 2 min, and stir counterclockwise for 3 min. The stirring speed is 300 rpm / min. During the stirring process, seal the container and control the temperature of the immersion solution at 45 °C.

[0061] b) Post-treatment with nano-solution

[0062] First, prepare the nano-material solution: the nano-material is nano-silica, and the mass fraction of nano-silica in the solution is 0.5%; the dispersant is cetyltrimethylammonium bromide, and the dosage is 30% of nano-silica; use ultrasound to disperse the nano-material solution, the ultrasound time is 15 min, and the ultrasound frequency is 20 kHz.

[0063] Then place the reinforced concrete test block processed in step a) into the pre-prepared nano-material solution, and then use a magnetic stirring device to control the rotation of the solution. Among them, the magnetic stirring mode is set to cyclic stirring, and a total of 4 cycles are carried out. The process of one cyclic stirring is: stir clockwise for 4 hours, pause for 8 hours, and stir counterclockwise for 4 hours. The stirring speed is 500 rpm / min. During the stirring process, seal the container and control the temperature of the immersion solution at 60 °C. Then take out the reinforced concrete block, rinse it with tap water and dry it to obtain the synergistic post-treatment anti-corrosion reinforced concrete.

[0064] Example 5

[0065] 1. Preparation of the reinforced concrete block to be treated:

[0066] The water-cement ratio of the concrete is 0.5, the mass ratio of cement:sand:stone is 1:3:2, and the size of the concrete block is 10×10×10 cm. The selected steel bar material is Q235 steel, and the size of the steel bar is 1 cm in diameter and 15 cm in length. Add polycarboxylate water reducer with a content of 0.1% of the solution mass. After the reinforced concrete is poured, it is left to stand for 1 d in an environment of 25 °C and then demolded, and then cured in an environment of 25 °C temperature and 95% humidity for 28 d and then taken out.

[0067] 2. Post-rust inhibition treatment process:

[0068] a) Post-treatment with rust inhibitor

[0069] First, prepare the rust inhibitor solution: the rust inhibitor is 1,6-hexanediamine, and the mass fraction of the rust inhibitor in the solution is 0.3%.

[0070] Then place the reinforced concrete block into the pre-prepared rust inhibitor solution, and then use a magnetic stirring device to control the rotation of the solution. During the whole process, the top of the container containing the rust inhibitor is sealed. Among them, the magnetic stirring mode is set to cyclic stirring, and after one cycle, the next cycle is automatically repeated, and the total cyclic stirring time lasts for 14 days. The process of one cyclic stirring is: stir clockwise for 5 min, pause for 2 min, and stir counterclockwise for 5 min. The stirring speed is 300 rpm / min. During the stirring process, seal the container and control the temperature of the immersion solution at 50 °C.

[0071] b) Post-treatment with nano-solution

[0072] First, prepare the nano-material solution: the nano-material is nano-silica, and the mass fraction of nano-silica in the solution is 1%; the dispersant is cetyltrimethylammonium bromide, and the dosage is 30% of nano-silica; use ultrasonic to disperse the nano-material solution, the ultrasonic time is 15 min, and the ultrasonic frequency is 20 kHz.

[0073] Then place the reinforced concrete specimens processed in step a) into a pre-prepared nano-material solution, and then use a magnetic stirring device to control the rotation of the solution. Among them, the magnetic stirring mode is set to cyclic stirring, and a total of 5 cycles are carried out. The process of one cyclic stirring is: stir clockwise for 6 hours, pause for 8 hours, and stir counterclockwise for 6 hours. The stirring speed is 500 rpm / min. During the stirring process, seal the container and control the temperature of the immersion solution at 65 °C. Then take out the reinforced concrete block, rinse it with tap water and dry it to obtain the synergistic post-treatment anti-corrosion type reinforced concrete.

[0074] Example 6

[0075] 1. Preparation of the reinforced concrete block to be treated:

[0076] The water-cement ratio of the concrete is 0.5, the mass ratio of cement: sand: gravel is 1:3:2, and the size of the concrete block is 10×10×10 cm. The selected steel bar material is Q235 steel, and the size of the steel bar is 1 cm in diameter and 15 cm in length. Add polycarboxylate water reducer with a content of 0.1% of the solution mass. After the reinforced concrete is poured, it is left standing in an environment of 25 °C for 1 day and then demolded, and then cured in an environment of 25 °C temperature and 95% humidity for 28 days and then taken out.

[0077] 2. Post-rust inhibition treatment process:

[0078] a) Post-treatment with rust inhibitor

[0079] First, prepare a rust inhibitor solution: the rust inhibitor is pyridoxine, and the mass fraction of the rust inhibitor in the solution is 0.5%.

[0080] Then place the reinforced concrete block into the pre-prepared rust inhibitor solution, and then use a magnetic stirring device to control the rotation of the solution. During the whole process, the top of the container containing the rust inhibitor is sealed. Among them, the magnetic stirring mode is set to cyclic stirring, and after one cycle ends, it automatically repeats the next cycle, and the total cyclic stirring time lasts for 14 days. The process of one cyclic stirring is: stir clockwise for 8 min, pause for 2 min, and stir counterclockwise for 8 min. The stirring speed is 300 rpm / min. During the stirring process, seal the container and control the temperature of the immersion solution at 55 °C.

[0081] b) Post-treatment with nano-solution

[0082] First, prepare a nano-material solution: the nano-material is nano-silica, and the mass fraction of nano-silica in the solution is 1.5%; the dispersant is cetyltrimethylammonium bromide, and the dosage is 30% of nano-silica; use ultrasonic to disperse the nano-material solution, the ultrasonic time is 15 min, and the ultrasonic frequency is 20 kHz.

[0083] Then, place the reinforced concrete specimens processed in step a) in a pre-prepared nano-material solution, and then use a magnetic stirring device to control the rotation of the solution. Among them, the magnetic stirring mode is set to cyclic stirring, with a total of 6 cycles. The process of one cyclic stirring is: stir clockwise for 8 hours, pause for 8 hours, and stir counterclockwise for 8 hours. The stirring speed is 500 rpm / min. During the stirring process, seal the container and control the temperature of the immersion solution at 70 °C. Then take out the reinforced concrete block, rinse it with tap water and dry it to obtain the synergistic post-treatment anti-corrosion type reinforced concrete.

[0084] Comparative Example 1

[0085] The preparation and curing processes of the reinforced concrete blocks are the same as those in the examples, but no inhibitor post-treatment and nano-solution post-treatment are carried out.

[0086] Comparative Example 2

[0087] The preparation and curing processes of the reinforced concrete blocks are the same as those in the examples, but 0.1% of triethylenetetramine inhibitor by the mass of the solution is added during the concrete mixing process. In this comparative example, no inhibitor post-treatment and nano-solution post-treatment are carried out.

[0088] Comparative Example 3

[0089] The preparation and curing processes of the reinforced concrete blocks are the same as those in the examples, but 0.1% of carbon nanotubes by the mass of the solution is added during the concrete mixing process. Before incorporating into the concrete, the carbon nanotube solution is dispersed first. The dispersant is sodium dodecylbenzenesulfonate, and the dosage is 10% of the carbon nanotube dosage; the nano-material solution is dispersed by ultrasonic waves, the ultrasonic time is 15 min, and the ultrasonic frequency is 20 kHz. In this comparative example, no inhibitor post-treatment and nano-solution post-treatment are carried out.

[0090] Anti-corrosion ability test:

[0091] Immerse the reinforced concrete blocks prepared in the examples and comparative examples in a 4% sodium chloride solution. Use electrochemical means to test the anti-corrosion performance of the specimens. From Figure 1 the open circuit potential and corrosion current density data, it can be seen that compared with using inhibitors and nano-materials according to the traditional method, the preparation method of the synergistic post-treatment anti-corrosion type reinforced concrete in the present invention can effectively improve the anti-corrosion effect of the reinforced concrete, which is obvious whether in the initial or late stage of immersion. In addition, by applying inhibitors and nano-materials through the synergistic post-treatment method, it can also effectively reduce the negative impact of the inhibitor on the concrete itself, improve the migration performance of the inhibitor, reduce the dosage of nano-materials and other advantages.

[0092] Corrosion current density table (μA / cm2 ):

[0093]

[0094] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A preparation method of collaborative post-treatment anti-corrosion reinforced concrete, characterized in that, It includes the following steps: Step (1) Preparation of the reinforced concrete block to be processed: The water-cement ratio of the concrete is 0.5, the mass ratio of cement:sand:stone is 1:3:2, and the size of the concrete block is 10×10×10 cm; during the concrete mixing process, a polycarboxylate water-reducing agent with a mass of 0.1% of the solution is added. Step (2) Post-treatment process: a) Post-treatment with rust inhibitor Place the reinforced concrete block in a pre-prepared rust inhibitor solution, and then control it with a magnetic stirring device to make the solution rotate; among them, the magnetic stirring mode is set to cyclic stirring, and the next cycle will be automatically repeated after one cycle ends, and the total cyclic stirring time lasts for 14 days; the process of one cyclic stirring is: stir clockwise for 3 - 8 min, pause for 2 min, and stir counterclockwise for 3 - 8 min; the stirring speed is 300 rpm / min. During the stirring process, seal the container and control the temperature of the soaking solution to be 45 - 55°C. b) Post-treatment with nano-solution Place the reinforced concrete test block treated in step a) in a pre-prepared nano-material solution, and then control it with a magnetic stirring device to make the solution rotate; among them, the magnetic stirring mode is set to cyclic stirring, and a total of 4 - 6 cycles are carried out; the process of one cyclic stirring is: stir clockwise for 4 - 8 hours, pause for 8 hours, and stir counterclockwise for 4 - 8 hours; the stirring speed is 500 rpm / min; during the stirring process, seal the container and control the temperature of the soaking solution to be 60 - 70°C; then take out the reinforced concrete block, rinse it with tap water and dry it to obtain the synergistic post-treatment anti-corrosion type reinforced concrete.

2. The preparation method of a collaborative post-treatment type anti-corrosion reinforced concrete according to claim 1, characterized in that: In step (1), the steel bar material is Q235 steel, and the size of the steel bar is 1 cm in diameter and 15 cm in length.

3. The preparation method of a collaborative post-treatment type anti-corrosion reinforced concrete according to claim 1, characterized in that: After the reinforced concrete is poured in step (1), it is left to stand for 1 d in an environment of 25°C and then demolded, and then cured in an environment of 25°C temperature and 95% humidity for 28 d and then taken out.

4. The preparation method of a collaborative post-treatment anti-corrosion reinforced concrete according to claim 1, characterized in that: In the rust inhibitor solution in step (2), the rust inhibitor is triethylenetetramine or 1,6-hexanediamine or pyridoxine, and the mass fraction of the rust inhibitor in the solution is: 0.1% - 0.5%.

5. The preparation method of a collaborative post-treatment type anti-corrosion reinforced concrete according to claim 1, characterized in that: In the nano-material solution in step (2), the nano-material is carbon nanotube or nano-silica; the mass fraction of carbon nanotube in the solution is: 0.1% - 0.3%, the dispersant is sodium dodecylbenzenesulfonate, and the dosage is 10% of the carbon nanotube dosage; the mass fraction of nano-silica in the solution is: 0.5 - 1.5%, the dispersant is cetyltrimethylammonium bromide, and the dosage is 30% of the nano-silica.

6. The preparation method of a collaborative post-treatment type anti-corrosion reinforced concrete according to claim 1, characterized in that: In step (2), after the solution is prepared, ultrasonic is used to disperse the nano-material solution, and then the solution post-treatment process is started. The ultrasonic time is 15 min and the ultrasonic frequency is 20 kHz.

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